benchmark

adam

☺️ /home/gr33n7007h $ cat adam.rb 
require 'benchmark/ips'

data = 100_000.times.map { |i| "#{i} #{[*?a..?z].sample(7).join}\n" }.join

Benchmark.ips do |x|
  x.report("lines")       { data.lines.map{ |line| line.split }.map{ |pid, prog| [pid.to_i, prog] } }
  x.report("each_slice")  { data.split.each_slice(2).map { |pid, prog| [pid.to_i, prog] } }
  x.report("with_object") { data.split.each_slice(2).with_object([]) { |(pid, prog), container| container << [pid.to_i, prog] } }
  x.report("each_line")   { data.each_line.map { |line| line.split.yield_self {|pid, prog| [pid.to_i, prog] } } }
  x.compare!
end  
☺️ /home/gr33n7007h $ ruby adam.rb 
Warming up --------------------------------------
               lines     1.000  i/100ms
          each_slice     2.000  i/100ms
         with_object     1.000  i/100ms
           each_line     1.000  i/100ms
Calculating -------------------------------------
               lines     13.661  (±14.6%) i/s -     66.000  in   5.032011s
          each_slice     19.199  (± 5.2%) i/s -     96.000  in   5.008917s
         with_object     13.444  (± 7.4%) i/s -     67.000  in   5.019100s
           each_line     11.320  (± 8.8%) i/s -     56.000  in   5.000041s

Comparison:
          each_slice:       19.2 i/s
               lines:       13.7 i/s - 1.41x  slower
         with_object:       13.4 i/s - 1.43x  slower
           each_line:       11.3 i/s - 1.70x  slower